Think carefully before buying cheap sockets. A good socket set is a lifetime tool. That's one kind of tool where cheap usually results in failure sooner or later. Harbor Freight is reasonably priced, but in most cases lower grade. Probably OK as long as you're not doing strenuous work with them...but it's when you're stuck and you need a good socket that it matters. To address your question more directly, you can buy sockets individually at pawn shops...I've done that when I needed an odd size, and I usually can find decent quality ones.